Investigation of Induced Resistance in Wheat to Sitobion avenae (Hemiptera: Aphididae) under Greenhouse Conditions

English grain aphid, Sitobion avenae (Fabricius), is an important worldwide phloem-feeding pest of wheat due to direct sucking damage and transmission of viruses. Here, we tested the effects of six treatments on the fitness traits of S. avenae including: (۱) Wheat with a ۶-days aphid infestation, (۲) Wheat sprayed with Biomin zinc, (۳) Wheat seed treated with Bacillus subtilis, and (۴ and ۵) Combined treatments of Biomin zinc+pre-infestation and B. subtilis+pre-infestation as well as (۶) A control treatment. Results revealed that there were significant differences among treatments concerning some allelochemical contents and aphid fitness traits. Treated with B. subtilis+pre-infestation and B. subtilis increased the total contents of phenol in the wheat leaves versus Biomin zinc+pre-infestation (۱۸۳.۶۳ mg g-۱ FW). The net Reproductive rate (R۰) of S. avenae was significantly reduced by B. subtilis+pre-infestation (۱.۵۳۳ offspring per adult) compared to the control (۶.۸۸۷ offspring per adult). Treated with B. subtilis+pre-infestation (۰.۰۲۲ d-۱) significantly reduced the intrinsic rate of increase (r) of S. avenae compared with the control (۰.۱۰۵ d-۱). The lowest (۰.۰۲۴) and highest (۰.۰۵۸) Nymph Growth Index (NGI) of aphid were found on B. subtilis+ pre-infestation and the control, respectively. Hence, it was concluded that B. subtilis+pre-infestation in wheat plants can induce systemic resistance to S. avenae, which can be used in the IPM of this aphid.

کلیدواژه ها:

Age-stage ، Aphid ، Bacillus subtilis ، Life table ، Plant-insect interactions.